US11371591B2 - Tensioner lever - Google Patents

Tensioner lever Download PDF

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Publication number
US11371591B2
US11371591B2 US17/036,285 US202017036285A US11371591B2 US 11371591 B2 US11371591 B2 US 11371591B2 US 202017036285 A US202017036285 A US 202017036285A US 11371591 B2 US11371591 B2 US 11371591B2
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United States
Prior art keywords
chain
support
point
pressing arm
lever
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US17/036,285
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US20210131531A1 (en
Inventor
Kenji Muratsubaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsubakimoto Chain Co
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Tsubakimoto Chain Co
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Publication date
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Assigned to TSUBAKIMOTO CHAIN CO. reassignment TSUBAKIMOTO CHAIN CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURATSUBAKI, KENJI
Publication of US20210131531A1 publication Critical patent/US20210131531A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/06Gearings for conveying rotary motion by endless flexible members with chains
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0802Actuators for final output members
    • F16H2007/081Torsion springs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0863Finally actuated members, e.g. constructional details thereof
    • F16H2007/0872Sliding members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0889Path of movement of the finally actuated member
    • F16H2007/0893Circular path
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0889Path of movement of the finally actuated member
    • F16H2007/0897External to internal direction

Definitions

  • the present invention relates to a tensioner lever that slidably guides a running chain, and more particularly to a chain tensioner lever that slidably guides a chain by pressing a shoe surface of a lever body toward the chain by elastic force of a torsion coil spring.
  • tensioner lever that removes slackness in a chain and prevents vibration of a running chain in a chain transmission for an auxiliary machine or the like of a car engine
  • tensioner lever which is pivotably attached to an attachment surface of an engine block or the like, and includes a lever body having a shoe surface that slidably guides the chain and a torsion coil spring interposed between the lever body and the attachment surface to press the shoe surface toward the chain
  • Such a tensioner lever is attached to an attachment surface such that a helical part of the torsion coil spring is loosely fitted around an outer circumferential surface of a boss part formed to protrude from a base part of the lever body toward the attachment surface, a pressing arm extending from one end of the helical part contacts the lever body, and that a distal end portion of a support arm extending from the other end of the helical part is inserted in a spring retention hole formed in the attachment surface.
  • the torsion coil spring In the tensioner lever like this, receiving load from the chain, the torsion coil spring is twisted, whereby a reaction force in accordance with the twisted amount (angular change of the pressing arm) is obtained.
  • the present invention solves this problem and it is an object of the invention to provide a tensioner lever capable of consistently exerting appropriate reaction force to various fluctuations of tension in conjunction with varying chain behavior, and reducing vibration and noise when the chain runs.
  • a tensioner lever including: a lever body having a shoe surface that slidably guides a chain and rotatably supported on a pivot shaft provided upright on an attachment surface; and a torsion coil spring interposed between the lever body and the attachment surface to press the shoe surface toward the chain, the torsion coil spring including a helical part loosely fitted to a cylindrical boss part provided to the lever body, a pressing arm extending from one end of the helical part and having as a first loading point a distal end portion contacting the lever body, and a support arm extending from another end of the helical part and having as a first support point a distal end portion contacting and being supported by a support part provided to the attachment surface.
  • the tensioner lever further includes a spring load adaption structure configured, when a certain level or more of load is received from the chain, to form one or both of a second loading point where the pressing arm contacts the lever body in a position different from the first loading point, and a second support point where the support arm contacts the support part in a position different from the first support point.
  • one or both of a second loading point and a second support point are formed when a certain level or more of load is received from the chain so that the load from the chain is divided, and therefore the spring load of the torsion coil spring can be increased.
  • the load received from the chain is small, the load is received only at the first loading point, and the chain will not be pressed with more reaction force than necessary. Correct reaction force can thus be exerted consistently, so that chain bouncing at the start of the engine can be prevented.
  • Dividing the load from the chain reduces the twisting amount of the torsion coil spring, which enables the spring to exert correct reaction force in response to tension fluctuations that accompany sudden changes in chain behavior.
  • Forming one or both of the second loading point and the second support point changes the normal frequency (normal mode frequency) of the chain, which helps to attenuate resonance in the chain in the event that the chain undergoes resonance in a high frequency range.
  • the configuration set forth in claim 3 prevents deterioration of the capability of following changes in chain behavior, which may be caused if the reaction force of the torsion coil spring becomes too small.
  • the same effects as when the spring load adaption structure is configured to form a second loading point can be achieved. Moreover, it is not necessary to provide the spring load adaption structure to the lever body, so that the assembling of the torsion coil spring to the lever body will not be hindered. Moreover, if the spring load adaption structure is configured to form a second loading point and a second support point, the capability of following changes in chain behavior can be readily improved.
  • FIG. 1 is a diagram illustrating one example of a manner of use of a tensioner lever that is one embodiment of the present invention
  • FIG. 2 is a side view on the back side illustrating the configuration of the tensioner lever
  • FIG. 3 is a perspective view on the back side illustrating the configuration of the tensioner lever
  • FIG. 4 is a schematic diagram illustrating a state of a torsion coil spring in a state in which the tensioner lever is attached to an attachment surface
  • FIG. 5 is a schematic diagram illustrating a state of a torsion coil spring when a high load is applied
  • FIG. 6 is a diagram illustrating one example of a manner of use of a tensioner lever that is another embodiment of the present invention.
  • FIG. 7 is a schematic diagram illustrating a state of a torsion coil spring in the tensioner lever illustrated in FIG. 6 when a high load is applied.
  • a tensioner lever that is one embodiment of the present invention will be hereinafter described with reference to the drawings.
  • the tensioner lever 100 is pivotably mounted on a pivot shaft Pa protruding from an attachment surface (not shown) of an engine block (not shown) or the like to slidably guide a chain CH running between a drive-side sprocket SP 1 attached to a crankshaft and a driven-side sprocket SP 2 attached to a shaft of an auxiliary machine to keep an appropriate chain tension.
  • the tensioner lever 100 includes a lever body 110 made of a synthetic resin or the like, and a torsion coil spring 120 made of metal or the like and interposed between the lever body 110 and the attachment surface.
  • the lever body 110 has a lever circumferential wall 111 formed substantially in a comma-like shape in side view, as illustrated in FIG. 2 .
  • the lever circumferential wall 111 includes, as also illustrated in FIG. 3 , a circular arc circumferential wall part 111 a having a shape conforming to the circumference of a concentric circle having the same center as the pivot shaft Pa, a substantially planar circumferential wall part on one side 111 b continuous with one end of the circular arc circumferential wall part 111 a and extending toward the chain CH, a chain-side circumferential wall part 111 c with one end smoothly continuing from the other end of the circumferential wall part on one side 111 b , and having a shape conforming to a circular arc convex toward the chain CH, a substantially planar non-chain-side circumferential wall part 111 d with one end smoothly continuing from the other end of the circular arc circumferential wall part 111 a , and extending on the opposite side of the chain-side circumferential wall part 111 c , and a circumferential wall part on the other side 111 e in a circular arc shape smoothly continuing
  • the space surrounded by the lever circumferential wall 111 is partitioned to two cavities in the longitudinal direction by a reinforcing rib part 112 a provided between the chain-side circumferential wall part 111 c and the non-chain-side circumferential wall part 111 d .
  • One of the cavities positioned on one side forms a torsion spring accommodating part H.
  • the cavity positioned on the other side is partitioned in the axial direction (in which the pivot shaft Pa extends) by a partition wall part 113 and each part of the divided cavity is provided with a reinforcing rib part 112 b between the chain-side circumferential wall part 111 c and the non-chain-side circumferential wall part 111 d.
  • a lever side wall part 115 that covers the torsion spring accommodating part H is formed continuously from an end face on the opposite side from the attachment surface.
  • the lever side wall part 115 is formed with a shaft hole 116 in which the pivot shaft Pa is inserted.
  • a cylindrical boss part 117 is integrally formed to the lever side wall part 115 such as to protrude from the circumferential edge of the shaft hole 116 toward the attachment surface.
  • the end face of the boss part 117 on the side facing the attachment surface is formed to protrude slightly more toward the attachment surface than the lever circumferential wall 111 , which prevents other parts than this end face of the boss part 117 on the side facing the attachment surface from contacting the attachment surface, so that smooth pivoting (rotation) of the lever body 110 around the pivot shaft Pa is ensured.
  • a restricting protrusion 118 is formed on an outer circumferential surface of the boss part at the end on the side facing the attachment surface to restrict the torsion coil spring 120 from moving toward the attachment surface. This way, in a state before the tensioner lever 100 is attached to the attachment surface, the torsion coil spring 120 is prevented from coming off of the lever body 110 , and also, in a state where the tensioner lever 100 is attached to the attachment surface, the torsion coil spring 120 is prevented from interfering with the attachment surface.
  • the torsion coil spring 120 includes a helical part 121 , a pressing arm 122 extending from one end of the helical part 121 , and a support arm 123 extending from the other end of the helical part 121 .
  • the pressing arm 122 has a distal end portion 122 a bent toward the attachment surface, while the support arm 123 has a distal end portion 123 a bent in the opposite direction from the attachment surface.
  • the torsion coil spring 120 is set in the lever body 110 with the helical part 121 loosely fitted around the outer circumferential surface of the boss part 117 .
  • the distal end portion 122 a of the pressing arm 122 forms a first loading point P 1 by being abutted on an inner surface of the chain-side circumferential wall part 111 c
  • the support arm 123 extends out of the lever body 110 through a cut-out portion 114 provided to the circular arc circumferential wall part 111 a , with the distal end portion 123 a thereof forming a first support point R 1 by being abutted to a support part W provided to the attachment surface (see FIG. 1 ).
  • the distal end portion of the pressing arm 122 is stopped by a spring lock rib 119 protruded from the inner surface of the chain-side circumferential wall part 111 c , so that a correct contact state of the distal end portion 122 a of the pressing arm 122 on the inner surface of the chain-side circumferential wall part 111 c is secured.
  • the resilient force of the torsion coil spring 120 exerts a torque on the lever body 110 around the pivot shaft Pa toward the chain CH so that the lever body presses the chain CH via the shoe surface S.
  • the tensioner lever 100 includes a spring load adaption structure 130 configured to form a second loading point where the pressing arm 122 contacts the lever body 110 in a position different from the first loading point P 1 when the tensioner lever receives a certain level or more of load from the chain CH.
  • the spring load adaption structure 130 includes an abutment part forming wall 131 formed to protrude from the inner surface of the chain-side circumferential wall part 111 c.
  • the abutment part forming wall 131 includes a flat inner wall surface 132 facing the pressing arm 122 , and in a state in which the tensioner lever 100 is attached to the attachment surface, the inner wall surface 132 is spaced apart from the circumferential surface of the pressing arm 122 .
  • the spring load adaption structure 130 is configured such that, when the pressing arm 122 contacts the abutment part forming wall 131 , the area of contact between the pressing arm 122 and the abutment part forming wall 131 gradually increases.
  • the pressing arm 122 warps such as to be convex toward the circumferential wall part 111 c as illustrated in FIG. 5 , so that the circumferential surface of the pressing arm 122 gradually comes into contact with the inner wall surface 132 of the abutment part forming wall 131 .
  • This helps to prevent a sudden change in spring load of the torsion coil spring 120 that may accompany the contact between the pressing arm 122 and the abutment part forming wall 131 , which allows for even more reliable exertion of correct reaction force.
  • the abutment part forming wall 131 is formed such that the second loading point P 2 will be located within a region L 1 of a length that is 2 ⁇ 3 of the length La of the pressing arm 122 from the first loading point P 1 , as illustrated in FIG. 4 . This allows for setting of an appropriate level of spring load of the torsion coil spring 120 , which allows for even more reliable exertion of correct reaction force. If the abutment part forming wall 131 is formed such that the second loading point P 2 will be located outside this region L 1 , the spring load of the torsion coil spring 120 may become excessive, and correct reaction force may not be exerted.
  • a spring load adaption structure may be configured to make contact with the pressing arm to form a second loading point when a high load is applied by changing the shape of the pressing arm of the torsion coil spring as suited, for example.
  • a torsion coil spring having a pressing arm for example, extending in a circular arc shape curved toward the chain-side circumferential wall part may be used to form a spring load adaption structure.
  • the spring load adaption structure has been depicted as being formed such that a second loading point is formed when a high load is applied in the embodiment described above, the spring load adaption structure may be configured such that a second support point is formed when a high load is applied, or, such that a second loading point and a second support point are formed when a high load is applied.
  • an abutment part forming wall 235 on the abutment surface side may be provided to a support part W of the abutment surface, as illustrated in FIG. 6 .
  • the spring load adaption structure 230 is configured such that, when the support arm 123 contacts the abutment part forming wall 235 on the abutment surface side, the area of contact between the support arm 123 and the abutment part forming wall 235 on the abutment surface side gradually increases.
  • the abutment part forming wall 235 on the abutment surface side has a flat inner wall surface 236 , and when a high load is applied, the support arm 123 warps such as to be convex toward the support part W as illustrated in FIG. 7 , so that the circumferential surface of the support arm 123 gradually comes into contact with the inner wall surface 236 of the abutment part forming wall 235 on the abutment surface side, thereby forming the second support point R 2 .
  • the abutment part forming wall 235 on the abutment surface side is formed such that the second support point R 2 will be located within a region of a length that is 2 ⁇ 3 of the length of the support arm 123 from the first support point R 1 .
  • the spring load adaption structure 230 may be configured by using a torsion coil spring having a support arm extending in a circular arc shape curved toward the support wall part.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US17/036,285 2019-11-06 2020-09-29 Tensioner lever Active 2040-11-29 US11371591B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JPJP2019-201200 2019-11-06
JP2019201200A JP7311781B2 (ja) 2019-11-06 2019-11-06 テンショナレバー
JP2019-201200 2019-11-06

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US20210131531A1 US20210131531A1 (en) 2021-05-06
US11371591B2 true US11371591B2 (en) 2022-06-28

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US17/036,285 Active 2040-11-29 US11371591B2 (en) 2019-11-06 2020-09-29 Tensioner lever

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US (1) US11371591B2 (ko)
JP (1) JP7311781B2 (ko)
KR (1) KR20210054985A (ko)
CN (1) CN112780736A (ko)
DE (1) DE102020127702A1 (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210356022A1 (en) * 2020-05-14 2021-11-18 Tsubakimoto Chain Co. Tensioner lever
US20230049971A1 (en) * 2021-08-16 2023-02-16 Tsubakimoto Chain Co. Tensioner lever

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7440738B2 (ja) * 2019-11-21 2024-02-29 株式会社椿本チエイン テンショナレバー

Citations (15)

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Publication number Priority date Publication date Assignee Title
US3148555A (en) * 1959-11-18 1964-09-15 Renault Automatic chain-tighteners
US4976659A (en) * 1988-03-25 1990-12-11 Skf Gmbh Slide rail for tightening a transmission
JP2000274501A (ja) 1999-03-24 2000-10-03 Tsubakimoto Chain Co チェーン伝動用テンショナレバー
US20090111629A1 (en) 2007-10-29 2009-04-30 Tsubakimoto Chain Co. Tensioner lever for chain drive
US7540817B2 (en) * 2003-12-26 2009-06-02 Tsubakimoto Chain Co. Tensioner with one-way clutch
JP2012036996A (ja) 2010-08-09 2012-02-23 Tsubakimoto Chain Co チェーン用テンショナレバー
WO2014044421A1 (de) * 2012-09-24 2014-03-27 Schaeffler Technologies AG & Co. KG Spannschuh
WO2015115381A1 (ja) * 2014-01-31 2015-08-06 株式会社ニフコ チェーンテンショナおよびチェーンテンショナのねじりコイルばねの取付構造
DE102014211517A1 (de) * 2014-06-17 2015-12-17 Schaeffler Technologies AG & Co. KG Spannschuh eines mechanischen Zugmittelspanners mit außen-/innenliegender verliergesicherter Befestigung einer Drehfeder
US20160252166A1 (en) * 2015-02-27 2016-09-01 Tsubakimoto Chain Co. Tensioner lever
US20170184183A1 (en) * 2015-12-24 2017-06-29 Tsubakimoto Chain Co. Tensioner lever
WO2019061464A1 (zh) * 2017-09-30 2019-04-04 舍弗勒技术股份两合公司 用于锁定机械张紧器的弹簧的锁定销和机械张紧器
WO2020100568A1 (ja) * 2018-11-14 2020-05-22 大同工業株式会社 チェーン用テンショナ
US20210156456A1 (en) * 2019-11-21 2021-05-27 Tsubakimoto Chain Co. Tensioner lever
US20210356022A1 (en) * 2020-05-14 2021-11-18 Tsubakimoto Chain Co. Tensioner lever

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148555A (en) * 1959-11-18 1964-09-15 Renault Automatic chain-tighteners
US4976659A (en) * 1988-03-25 1990-12-11 Skf Gmbh Slide rail for tightening a transmission
JP2000274501A (ja) 1999-03-24 2000-10-03 Tsubakimoto Chain Co チェーン伝動用テンショナレバー
US6428435B1 (en) 1999-03-24 2002-08-06 Tsubakimoto Chain Co. Tensioner lever for chain drive
US7540817B2 (en) * 2003-12-26 2009-06-02 Tsubakimoto Chain Co. Tensioner with one-way clutch
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JP2009108909A (ja) 2007-10-29 2009-05-21 Tsubakimoto Chain Co チェーン伝動用テンショナレバー
JP2012036996A (ja) 2010-08-09 2012-02-23 Tsubakimoto Chain Co チェーン用テンショナレバー
WO2014044421A1 (de) * 2012-09-24 2014-03-27 Schaeffler Technologies AG & Co. KG Spannschuh
WO2015115381A1 (ja) * 2014-01-31 2015-08-06 株式会社ニフコ チェーンテンショナおよびチェーンテンショナのねじりコイルばねの取付構造
DE102014211517A1 (de) * 2014-06-17 2015-12-17 Schaeffler Technologies AG & Co. KG Spannschuh eines mechanischen Zugmittelspanners mit außen-/innenliegender verliergesicherter Befestigung einer Drehfeder
US20160252166A1 (en) * 2015-02-27 2016-09-01 Tsubakimoto Chain Co. Tensioner lever
US20170184183A1 (en) * 2015-12-24 2017-06-29 Tsubakimoto Chain Co. Tensioner lever
WO2019061464A1 (zh) * 2017-09-30 2019-04-04 舍弗勒技术股份两合公司 用于锁定机械张紧器的弹簧的锁定销和机械张紧器
WO2020100568A1 (ja) * 2018-11-14 2020-05-22 大同工業株式会社 チェーン用テンショナ
US20210262552A1 (en) * 2018-11-14 2021-08-26 Daido Kogyo Co., Ltd. Chain tensioner
US20210156456A1 (en) * 2019-11-21 2021-05-27 Tsubakimoto Chain Co. Tensioner lever
US20210356022A1 (en) * 2020-05-14 2021-11-18 Tsubakimoto Chain Co. Tensioner lever

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JP2012-036996A Translation; Suzuki et al; Tensioner Lever for A Chain; Published: Feb. 23, 2012; Published By: Espacenet (Year: 2012). *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210356022A1 (en) * 2020-05-14 2021-11-18 Tsubakimoto Chain Co. Tensioner lever
US11668373B2 (en) * 2020-05-14 2023-06-06 Tsubakimoto Chain Co. Tensioner lever
US20230049971A1 (en) * 2021-08-16 2023-02-16 Tsubakimoto Chain Co. Tensioner lever
US11732784B2 (en) * 2021-08-16 2023-08-22 Tsubakimoto Chain Co. Tensioner lever

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JP7311781B2 (ja) 2023-07-20
KR20210054985A (ko) 2021-05-14
JP2021076140A (ja) 2021-05-20
DE102020127702A1 (de) 2021-05-06
US20210131531A1 (en) 2021-05-06
CN112780736A (zh) 2021-05-11

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